[Dovecot] Trouble with expire plugin

[Gedalya]

Hi all,

Maybe someone here can help me with this problem, not sure if this is a 
configuration issue or an actual bug.

my daily cron job says:

#!/bin/sh
doveadm expunge -A mailbox Junk savedbefore 14d
doveadm expunge -A mailbox Trash savedbefore 30d
doveadm expunge -A mailbox "Trash.*" savedbefore 30d

But it hasn't been deleting any messages in a long time, I'm not sure 
when it stopped working.

I've also noticed that it does delete matching rows in the expires 
database (expire_stamp < savedbefore days).
Furthermore, rows are deleted even when running doveadm search, and 
regardless of the mailbox column, i.e. even when != the mailbox name 
being searched!
Anyway why should doveadm search delete rows in the expires database?

The database is mysql.

----   dovecot -n  ----
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-0.bpo.3-amd64 x86_64 Debian 6.0.6
auth_default_realm = xxxxxxx.com
auth_mechanisms = plain login cram-md5
auth_verbose = yes
auth_verbose_passwords = plain
default_client_limit = 8096
dict {
  expire = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
  quota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
mail_gid = vmail
mail_plugins = quota expire listescape
mail_uid = vmail
managesieve_sieve_capability = fileinto envelope encoded-character 
subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables mailbox date ihave
namespace {
  inbox = yes
  location =
  prefix =
  separator = /
  type = private
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  antispam_backend = pipe
  antispam_pipe_program = /usr/bin/ssh
  antispam_pipe_program_args = 
-l;spamd;-i;/etc/dovecot/sareport.key;mx1.xxxxxxx.com
  antispam_pipe_program_notspam_arg = revoke
  antispam_pipe_program_spam_arg = report
  antispam_pipe_tmpdir = /tmp
  antispam_spam = Junk
  antispam_trash_pattern_ignorecase = trash;Deleted *
  autocreate = Trash
  autocreate2 = Junk
  autocreate3 = Drafts
  autocreate4 = Sent
  autosubscribe = Trash
  autosubscribe2 = Junk
  autosubscribe3 = Drafts
  autosubscribe4 = Sent
  expire = Trash
  expire2 = Trash.*
  expire3 = Junk
  expire_dict = proxy::expire
  quota = dict:user::proxy::quota
  quota_rule = *:storage=2G
  quota_rule2 = Trash:storage=+250M
  quota_rule3 = Junk:ignore
  quota_warning = storage=99%% quota-warning 99 %u
  quota_warning2 = storage=95%% quota-warning 95 %u
  sieve = ~/.dovecot.sieve
  sieve_before = /var/local/lib/dovecot/sieve/global/fileinto-spam.sieve
  sieve_dir = ~/sieve
  sieve_extensions = -vacation -body -reject -enotify -environment 
-virustest -spamtest
  sieve_max_actions = 32
  sieve_max_redirects = 4
  sieve_max_script_size = 10K
  sieve_quota_max_scripts = 10
}
postmaster_address = postmas...@xxxxxxx.com
protocols = imap pop3 lmtp sieve
service auth-worker {
  user = $default_internal_user
}
service auth {
  client_limit = 20480
  unix_listener auth-userdb {
    group = root
    mode = 0600
    user = vmail
  }
}
service dict {
  unix_listener dict {
    mode = 0600
    user = vmail
  }
}
service imap-login {
  process_min_avail = 4
  service_count = 0
  vsz_limit = 128 M
}
service imap {
  process_limit = 10240
}
service lmtp {
  inet_listener lmtp {
    address = 0.0.0.0
    port = 7025
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
  service_count = 0
  vsz_limit = 128 M
}
service pop3-login {
  process_min_avail = 4
  service_count = 0
  vsz_limit = 128 M
}
service pop3 {
  process_limit = 4096
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning
  unix_listener quota-warning {
    user = vmail
  }
  user = vmail
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  driver = prefetch
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
verbose_proctitle = yes
protocol lmtp {
  mail_plugins = quota expire listescape sieve
}
protocol lda {
  mail_plugins = quota expire listescape sieve
}
protocol imap {
  mail_max_userip_connections = 25
  mail_plugins = quota expire listescape autocreate imap_quota antispam
  ssl_cert = </etc/dovecot/imap.xxxxxxx.com.crt
  ssl_key = </etc/dovecot/imap.xxxxxxx.com.key
}
protocol sieve {
  mail_max_userip_connections = 10
}
protocol pop3 {
  mail_max_userip_connections = 10
  mail_plugins = quota expire listescape
  pop3_fast_size_lookups = yes
  pop3_lock_session = no
  pop3_no_flag_updates = yes
  pop3_reuse_xuidl = yes
  pop3_save_uidl = no
  pop3_uidl_format = %08Xu%08Xv
  ssl_cert = </etc/dovecot/pop.xxxxxxx.com.crt
  ssl_key = </etc/dovecot/pop.xxxxxxx.com.key
}


in dovecot-sql.conf.ext I have:
iterate_query = SELECT userid as user, domain FROM email where deleted=0


---- dovecot-dict-sql.conf.ext ----
connect = host=localhost dbname=email user=email
map {
  pattern = priv/quota/storage
  table = quota
  username_field = username
  value_field = bytes
}
map {
  pattern = priv/quota/messages
  table = quota
  username_field = username
  value_field = messages
}
map {
  pattern = shared/expire/$user/$mailbox
  table = expires
  value_field = expire_stamp
  fields {
    username = $user
    mailbox = $mailbox
  }
}